Wow, everything is looking great! I agree with others that a true union ball valve for your return is a worthwhile purchase for setups with external pumps or other equipment fed from the return. In the past I've run the chiller off the system pump, and I liked having the true union because it was easier to pull and service the chiller. I'd suggest two things: anywhere you'll have a component that needs service or can fail, isolate it with a union ball valve. Also, no matter what ball valve you use, look for the best quality you can find. The lowest cost HD ones tend to freeze up pretty quickly, which makes them useless.